Machine for reducing tan-bark



(no Model.) B. HOLBROOK.

MACHINE FOR REDUCING TAN BARK.

Wf/flesses rzzeys.

UNITED STATES PATENT OFFICE.

BYRON HOLBROOK, OF KENOSHA, ASSIGNOR OF ONE-HALF TO JACOB ORYDERMAN, OF MILWAUKEE, VVISOONSIN.

MACHINE FOR REDUCING TAN-BARK.

SPECIFICATION forming part of Letters Patent No. 321,725, dated July 7, 1885.

Application filed October 18, 1884.

To all whom; it may concern.-

Be it known that I, BYRON HOLBROOK, of Kenosha, in the county of Kenosha, and in the State of Wisconsin, have invented certain new and useful Improvements in Machines for Reducing Tan-Bark; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to machines for reducing barksuch as tan-bark-and will be fully described hereinafter and claimed.

In the drawings, Figure 1 is a plan view of my machine. Fig. 2 is a side elevation, and Figs. 3 and 4 are details.

A is the frame of my machine.

B is a knifedisk mounted on a shaft, O, that has suitable horizontal hearings in the frame A, and carries a driving pulley, O.

D is an inclined feed-table, of triangular shape, and D is a side board that guides the bark to the knives a on the knife-disk. The edge of the feed-table adjacent to the knifedisk lies parallel with it, and this edge of the table has fixed to it a shear-plate, b. The knife-disk B is made with a series of tangential slots, d (I, over which the knives or are fixed, so that their edges will project slightly beyond the face of the disk, as the knives of the ordinary jack-plane project beyond the bearing-face, and as the feed-table is inclined the knives, as they pass it, will each form first an acute angle and then an obtuse angle with it.

F are feed-rollers, the shafts f f f f f of which have bearings in the side bar, D, and these shafts carry sprocket-wheels, that are connected by drive-chains g g. The shaft f, in addition to its bearing in side bar, D, has a bearing in the under side of the central member of the frame A, and is there coupled with another shaft, G, that is driven by shaft 0 through chains HH,'shaft H and suitable sprocket-wheels or pulleys. The knives a are made with very keen edges, and the disk is run at a high rate of speed, and as the bark (No model.)

is fed down from the large end of the table it is taken by the feed-rolls and crowded against the disk, whose knives take it-and cut it at all angles to the grain, severingits ce1ls,and causing it to curl and break in every direction, leaving it fluffy and loose, and in condition to permit the water to soak through and draw out its substance, so that the maximum of the tanning principle may be extracted.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

-1. In a machine for reducing bark, the combination of the frameA, inclined feed-table D, extending within and to the base of the ma chine, and having side board, D, and shearplate I), with the disk B,havingtangential slots (1 d, and knives a a, substantially as shown and described.

2. In a machine for reducing bark, the combination of the frame A, inclined feed-board extending within the machine, disk B, carrying tangentially-arranged cutting-knives projecting beyond the face of the disk and above similarly-arranged tangential slots, feed-rolls F F, driving-shaft C, sprocket-wheels, shafts, and drive-chains, substantially as shown and described.

3. In a machine for reducing bark, the combination of frame A, disk B, having tangentially-arranged slots and knives, triangular inclined feed table D, provided with side board, D, and shear-plate b, shafts 0, H and G,feed-rollers F F,shafts f f ,sprocket-whee1s, and drive-chains H, H, g, and g, substantially as shown and described.

In testimony that I claim the foregoing I have hereunto set my hand, at Milwaukee, in the county of Milwaukee and State of \Viscousin, in the presence of two witnesses.

BYRON HOLBROOK.

Witnesses:

STANLEY S. STOUT, HAROLD G. UNDEEwoon. 

